Add rate-limit headers to the contact API - #68
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is-agentic flagged whiskey.fm for having no REST rate-limit headers on any probed endpoint. The two episode JSON routes are prerendered static files with no per-request server logic to attach headers to, but /api/contact is dynamic and the only endpoint that does real work (a Discord webhook call) on every hit, so it's the one worth limiting. Adds a small in-memory fixed-window limiter (5 req/min per client IP) and standard RateLimit-Limit/Remaining/Reset headers on every contact response, plus Retry-After on a 429. Scoped to a single instance by design - noted in the module docstring as a known limit if this ever needs to hold across regions. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughAdds fixed-window, in-memory rate limiting to the contact API. The endpoint limits each client to five requests per 60 seconds and returns rate-limit headers, ChangesContact API rate limiting
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The contact API now enforces a five-request-per-minute limit per client and returns standard rate-limit response headers. No concrete current-head merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant Client
participant ContactPOST
participant RateLimiter
participant Response
Client->>ContactPOST: POST contact request
ContactPOST->>RateLimiter: Check client key and limit
RateLimiter-->>ContactPOST: Allowance and reset metadata
ContactPOST-->>Response: Success or 429 response with headers
Response-->>Client: HTTP response
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Actionable comments posted: 3
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Inline comments:
In `@packages/starpod/src/lib/rate-limit.ts`:
- Line 64: Update the RateLimit-Reset header in the rate-limit response to emit
the non-negative number of seconds until result.resetAt, calculated from
Date.now(), while preserving the epoch timestamp for Retry-After; adjust the
rate-limit unit tests to assert the delay value.
- Line 32: Bound the bucket store used by the rate-limiting logic around
buckets.set so expired entries cannot accumulate for keys that are not
revisited. Use an existing bounded TTL cache if available, or add cleanup that
runs with a bounded workload while preserving per-key expiration and rate-limit
behavior.
- Line 55: Update the client-key derivation around the forwardedFor handling to
use trusted adapter connection metadata instead of the client-controllable
x-forwarded-for value, or ensure the trusted edge overwrites that header before
use; preserve the existing unknown fallback when trusted metadata is
unavailable.
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packages/starpod/src/lib/rate-limit.tspackages/starpod/src/pages/api/contact.tstests/unit/contact-api.test.tstests/unit/rate-limit.test.ts
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Three real issues from the automated review on shipshapecode#68: - RateLimit-Reset was emitting an absolute epoch timestamp; the IETF RateLimit header draft specifies it as seconds-until-reset (delta). Fixed and covered with a fake-timers test for both a future and an already-elapsed window. - The bucket Map had no eviction, so it grew by one entry per unique client key ever seen and never shrank. Added a prune pass (drop expired buckets) on every checkRateLimit call - cheap at this endpoint's real traffic, and keeps the map bounded to clients currently inside an active window. - clientKey read x-forwarded-for, which is spoofable behind an arbitrary reverse proxy. Vercel (this project's actual deployment target) already strips client-supplied X-Forwarded-For at the edge, but x-vercel-forwarded-for is the more explicit, Vercel-computed header and stays correct even behind an extra proxy in front of Vercel - prefer it, fall back to x-forwarded-for otherwise. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Addressed all 3 CodeRabbit findings in `e41b527` (RateLimit-Reset now emits delta-seconds per the IETF draft, added bucket pruning so the map can't grow unbounded, and `clientKey` now prefers `x-vercel-forwarded-for` over the spoofable `x-forwarded-for`). One note on CI: `e2e` is failing on both the original push and this one, but it's unrelated to this change - all 21 failures are in `tests/e2e/episode.spec.ts` (episode/transcript player pages, hardcoded against live feed content like `/120`), nothing in the contact API this PR touches. Looks like content drift against the live RSS feed rather than anything in this diff - flagging in case it's a known issue, happy to look closer if useful. |
1 participant
Summary
An
is-agentic.comscan of whiskey.fm flagged missing REST rate-limit response headers on every probed endpoint. Of the three API routes, only/api/contactis dynamic (prerender = false) and does real per-request work (a Discord webhook call) - the two episode JSON routes are prerendered static files with no server invocation at request time to attach headers to, so this scopes the fix to contact.src/lib/rate-limit.ts: small in-memory fixed-window limiter (5 req/min per client IP, derived fromx-forwarded-for).src/pages/api/contact.ts: every response (success, validation errors, and a new 429) now carriesRateLimit-Limit/RateLimit-Remaining/RateLimit-Reset; the 429 also sendsRetry-After.Known limitation, called out in the module docstring: state is per-instance/in-memory, so it won't hold a strict global limit across multiple regions/instances. That's an intentional scope call for now - a shared store (Upstash, Vercel KV) would be the upgrade if this needs to be airtight.
Test plan
pnpm exec vitest run tests/unit/rate-limit.test.ts tests/unit/contact-api.test.ts- 15 passing (8 new)pnpm run lint🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
Bug Fixes